Dinner After a Saturday Wedding

We are getting married at CTI, on a Saturday @ 4opm; with 4 additional guests. We will be having a cocktail hour, with a band, but I'm unsure about dinner afterwards. I wanted to have dinner that night on the Island, but there is a wedding there that night. I asked if we could do it on the beach, and they said no because it was the night of the Gala. They did give me three options, but as this is our first time going; I don't know which one to pick. Any input would be greatly appreciated.

1. A private reception in the Garden. However, I don't know if I want to pay $800.00 for a reception that is not by the water; where I really want it.